schwabzmann



(No Model.)

` J. SOHWARZMANN.

BUSH HAMMER.

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WITNESSES TOR.

/L/W ATTORNEYS.

UNITED Sterns PATENT Orrrcn.

JOHN SCHVARZMANN, OF VASHINGTON, DISTRICT OF COLUMBIA.

BUSH-HAMM ER.

SPECIFICATION forming part Of Letters Patent No. 303,594-, dated August 12, 1884. Application flled December 29,1883. (No model.)

10 @ZZ whom, it 'may concern.-

e it known that I, J onN SCHWARZMANN, a citizen of the United States, and a resident of Vashington, in the District of Columbia, have invented certain new and useful Improvements in Bush-Hammers; and I do hereby declare that the following is a full, clear, and eX- act description ofthe invention, Which will enable others skilled in the art to which it appertains to make and use the same, reference being had tothe accompanying drawings, which form a part of this specification, and in whichf- Figure l is a perspective view of my improved bush-hammer and its Wrench. Fig. 2 is a side view of the same, with one of the securing-bolts removed. Fig. 3 is a view of one of the bits. Fig. 4 is a view of the securingbolt, and Fig. 5 is a longitudinal section on line x x, Fig. 2.

Similar letters of reference indicate corre spending parts in all the figures.

My invention has relation to that class of bush-hammers in which the bits having corrugations or indentations correslionding to each Aother are clamped between a rigid and a removable jaw at each end of the poll; and it consists in theimproved construction and combination of parts of the same, as hereinafter more fully described and claimed.

In the accompanying drawings, the letter A indicates the head or poll of the hammerhav ing the usual eye, B, for the insertion of the handle C, and the ends of the poll are p/rovided at one side with projecting semicircular lips D, having semicireular grooves E near their edges. The end's of the poll form inside the lips semi-cylindrical projections F concentrie With the lips and having axial perforations G, and the sides of the poll, opposite to the side having the lips, form semieircular recesses I concentric with the lips and the projections, and. having semicircular grooves J of the same radius as the grooves in the lips.

j TWO threaded bolts, K, forming shoulders L at their upper ends, and circular heads M, having circular ribs N of the same radius as the grooves upon the lips and in the recess upon their inner faces, iit and turn in the perforations G in the semi-cylindrical projections,

Whi ch are screw-threaded, While the outer faces a corresponding number of lugs, I), upon the face of a disk, Q., having a handle, R, may iil, serving las a wrench to screw or unscrew the bolt.

S are the bits, the inner ends of which have a recess or notch, T, corresponding to the semicylindrical projections at the ends of the hammer-head, and the bits have each a semicircnlar corrugation, U, of the same radius as the grooves and circular ribs, and it will be seen that, as the bits are inserted, the raised sides ofthe corrugations upon the bits placed against the rigid lips will iit into the grooves, whereupon thc corrugations will fit into each other, and the ribs upon the bolt-heads will iit into the sunk sides of the corrugations in the bits immediately under the said heads, the grooves, corrugations, and ribs thus preventing the bits from becoming dislocated during use of the hammer, while one or more bits may easily be removed by loosening the screw-bolt, and another inserted and secured by tightening the bolt.

Having thus described myinvention, I claim and desire to secure by Letters Patent oi' the United Statesl l. The combination of the poll in a bush hammer having a lip upon one side of each end, a projection at each end having an axial female-threaded perforation, and a semieircnlar recess at each end in the other side, the recess and lip having corrugations, a number of bits having recesses or notches corresponding to the shape of the projections at the ends of the poll, and having corrugations corresponding to the corrugations upon the lips and in the recess, and a threaded bolt having a circular head tting into the semicircular recess, and provided upon its inner side with a corrugation corresponding to the corrugations in the recess and in the bit-s, as and for the purpose shown and set forth.

2. The combination, in a bush-hammer, of

the poll having the semicircular grooved projecting lips, the semi-cylindrical project1ons having` axial female-threaded perforations,mid In testimony that I claim the foregoing,` its the semieirenlzu' grooved recesses, thebitshnvmy own I have hereunto affixed my signature ing` semioiroular notches in their inner ends in presence of two Witnesses.

and having seniieiroular oorrugations, and the JOHN SGIDVARZMANN. 5 threaded bolts forming` circular heads having Vitnesses:

the Circular ribs upon their inner sides7 as and WVM. LECIYIER,

for the purpose shown and set forth. BENNETT S. JONES. 

